Federal Reserve Bank of Philadelphia. "May 1971," Business Review (Federal Reserve Bank of Philadelphia) (May 1971). https://fraser.stlouisfed.org/title/5580/item/557512, accessed on April 24, 2024.
Federal Reserve Bank of Philadelphia. "May 1971," Business Review (Federal Reserve Bank of Philadelphia) (May 1971). https://fraser.stlouisfed.org/title/5580/item/557512, accessed on April 24, 2024.